.certain_letter_btn{
  clear: both;
  float: right;
  width: 24%;
  height: 1.5rem;
  line-height: 1.55rem;
  font-size: 0.8rem;
  color: #ffffff;
  text-align: center;
  background-color: #e75555;
  border-radius: 2vw;
  margin-right: 5%;
  margin-top: 0.3rem;
  box-shadow: 1px 2px 3px 1px  #828283;
}
